Underfeed stoker



Nov. 2,1926. 1,605,665

- R. S. RILEY ET AL UNDERFEED STOKER Fi March 9, 1920 3 Sheets-Sheet 1 1Mari/rs ane: idem 13 WW:

Nov. 2, 1926.

R. s. RILEY ET AL UNDERFEED STOKER N I Ill a m A H k w 1 RW N N mm INov. 2, 1926.

R. S. RILEY ET AL UNDERFEED STOKER Filed March 9, 1920 3 Sheets-Sheet :5

. Patented Nov. 2, 1926.

UNITED STATES PATENT OFFICE.

ROBERT SANFORD RILEY AND JAMES W. ARMOUR, OF WORCESTER, MASSACHUSETTS,ASSIGNORS T SANFORD RILEY STOKER 00., OF WORCESTER, MASSACHUSETTS, A.

CORPORATION OF MASSACHUSETTS.

uunnarnnn sroxna.

This invention relates to underfeed stokers, and particularly to thattype of underfeed stoker in which the retorts or portions thereof arereciprocated during the opera- 6 tion of the stoker mechanism.

One object of our invention is to provide an improved construction ofrocking discharge member for such stokers, .in which air is admitted tothe fuel as it is supported 10 thereby or passes downwards toward adischarge opening.

Another object is to improve the construction of the discharge memberitself, and to provide a new and improved pivotal bearing 1 therefor.Further features of our invention relate to arrangements andcombinations of partswhich will be hereinafter described and moreparticularly pointed out in the appended claims.

A preferred form of our invention is shown in the drawings, in which-Fig. 1 is a partial sectional elevation of our improved stoker withcertain parts shown diagrammatically;

Fig. 2 is an enlarged sectional elevation of one of the dischargemembers, and parts associated therewith;

Fig. 3 is a detail front elevation taken in the direction of the arrow 3in Fig. 2;

Figs. 4 and. 5 are detail sectional views taken along the lines 44 and55 in Fig. 2 respectively Fig. 6 is a plan view of a discharge member;

Fig. 7 is a side view thereof;

Fig. 8 is a detail sectional View taken along the line 88 in Fig. 2;

Fig. 9 is a side elevation of a slightly different arrangement of ourinvention; and 40 Fig. 10 is a partial plan view of the stoker shown inFig. 1.

Referring to the drawing, and particularly to Fig. 1, we have shown ourinvention embodied 1n a duplex underfeed stoker in 45 which oppositelydisposed retorts discharge their refuse above a pair of clinker grindersdisposed between and below the inner or rear ends of the retorts.Eachhalf of the stoker preferably comprises a plurality of retortshaving movable side walls 20. uel issupplied to each retort from ahopper 21 by a plunger 22 driven by a crank shaft 23. Lostmotionconnections 23 are provided between the plunger and the side-walls, sothat the a grate section for The blocks 25 constitute rear bearings forthe side walls, and are also each provided with concave segmentalbearing surfaces 27 and 28 adapted to receive similar convex bearingsurfaces 29 and 30, formed on the upper end of each discharge member 24.

This member 24 is provided withan air chamber 31 covered by a pluralityof grate sections 32 (Figs. 6 and 7). The sides of the member 24 areprovided with inwardly projecting flanges 33 (Fig. 5) adapted to fitbetween a projecting outer portion 34 of the grate section 32 and asmaller inner projection 35. The grate sections 32 are placed inposition by inserting them at the open upper end of the discharge member24, and they are held in position by a removable plate or cap 36 (Fig.2) secured by bolts 37 to a hub member 38.- v

The hub member 38 fits in a recess 39 in the upper end of the dischargemember 24 and is provided with bearings for a rod 40 which also extendsthrough the recessed ends of a pair of eye-bolts 41. These bolts 41extend forward in the block 25 to the front edge of the block, wherethey are firmly secured to a flange 42 (Fig. 2) by locking nuts 43 and44. By adjustment of the nuts 43 and 44, the discharge member 24 may befirmly. seated against the bearing surfaces 27 and 28. It will be notedthat all parts of the bearing are of such construction thataccurateworkmanship is unnecessary. and that the parts may .bereadily'removed and replaced when necessary. Furthermore. the retainingnuts 43 and 44 are removed from the region of extreme heat which wouldtend to destroy the usefulness thereof.

The frame member 26 upon which the block 25'is supported alsoconstitutes an air duct extending transversely of the series of retorts,and is provided with upper 'openings 45 through which air may enter apas sage 46 in the block 25', and then pass through the recessBQ to thechamber 31, from which it is discharged between the grate sections 32.Dampers 47 (Fig. 2) control the admission of air to the blocks 25 (Figs.2 and 3). All of the dampers 47- are mounted upon a shaft 48 extendingtransversely of the furnace and manually adjusted in any convenientmanner.

The lower end of each discharge member 24 rests against a roller 50mounted at the rear end of a rack bar 51 slidable in fixed bearings inthe frame of the stoker and engaged by a pinion 52 on a shaft 53extending transversely of the furnace and havmg at its outer end a wormwheel 54 rotatable by a worm 55 connected to a hand wheel 56. The rackbars 51 may thus be moved forward or rearward to vary the position andoperation of the discharge members 24.

' Separate dead plate sections 57 (Figs. 2 and 8) are provided at thelower end of each discharge member 24, said sections 57 having slottedrearward projections 58 extending through openings 59 in the member 24,and adapted toreceive headed fastening members 60. Each section 57 maybe readily removed and'replaced when necessary.

In Fig. 1 we have shown oppositely disposed furnaces cooperatin with apair of clinker grinders located etween the opposed retorts and belowtheir discharge members. These grinders rotate so that their upperportions approach each other, and

air supp may be actuated by a pawl and ratchet mechanism from the crankshaft 23 as indicated in Fig. 1. This driving mechanism is mere- 1yillustrative and any other'suitable driving mechansm may be provided.

Havin thus described the construction of our mproved stoker mechanism,the

operation and utility thereof will be ap parent. 7 7

Each discharge member 24 is pivoted directly to a reciprocating retortsection. The

lied through the ate section thereof contmues the combustion of anyunconsumed carbon during the progress of the refuse along the dischargemember towards the clinker grinder. The fuel .is thus thoroughly.agitated and is supplied with air under pressure-to consume the lastremnants of carbon therein.

by a fan or blower (not shown) or by other suitable mechanism forming nopart of our invention.

All parts are of simple construction, easily removed. and replaced, andprovision is This air is provided made for all necessary adjustments inthe operation thereof. I

"In Fig. 9 we have shown a furnace of the sin le instead of the duplextype and have omitted the clinker grinder. The rockin discharge member65 is of somewhat di ferent curvature and is adjusted in such a 65 feedsthe refuse downward and crushes it'against the rear wall 66 of thefurnace. The upper portion 65 of the discharge member 65 may be providedwith air admitting grate sections and the portion 65 with dead platesections, all as previously shown and described. A clinker grinder maybe used with the single furnace shown in Fig. 9, as well as in thecombination shown in Fig. 1, but it not considered neces sary to includea drawing to show such use. It will also be understood that the type ofdischarge member shown in Fig. 2 may be equally well used in' thecombination shown in Fig. 9. 7

Having thus described our invention, it will be evident that changes andmodifications can be made therein by those skilled in the art within thespirit and scope of our invention as set forth in the claims, and we donot wish to be otherwise limited to the details herein disclosed, butwhat we claim is 2- 1. An underfeed stoker having in combination aretort with movable side walls, a plurality of ash discharge memberseach connected at one end for movement with one of said side walls andextending downward to form one side of an ash discharge pocket, andmeans to reciprocate each wall and oscillate each membr, said dischargemembers each having an air chamber in its upper portion and grateopenings therefor in its upper rear surface.

, a movable ash discharge member extending downward to form one side ofan ash receiving pocket and having an air chamber in its upper portion,a plurality of removable grate sect-ions covering said chamber, andremovable dead plate sections secured to the lower portion of saiddischarge member.

3. An underfeed stoker having, in combination, a plurality oflongitudinally movable retort members, movable ash discharge membersassociated therewith and forming one side of an ash receiving pocket,each discharge member being chambered and having an overfeed gratesectioniand a pivotal bearing connection between each retort member andits discharge member, said hearing connection having an air passagetherethrough by which air is conducted to said grate section. I 4. Anunderfeed stoker havin in combination, a movable retort mem er, a rearsupport therefor, an ash discharge member movable with said retortmember and extending. downward to form one side of an ash receivingpocket, said ash discharge member having an air chamber therein 1 andnation, a movable retort member,

a gratesection overlying said chamber, said support having spacedconcave segmental bearing surfaces bordering an air passage and said ashdischarge member having spaced convex bearing surfaces co-operating withsaid concave bearing surfaces and having a radially disposed airadmitting passage between said convex bearing surfaces, and means tohold said concave and convex bearing surfaces in engagement with eachother.

5. An underfeed stoker, having, in combia rear support therefor, and amovable ash discharge member extending downward to form one side of anash receiving pocket, said support having concave segmental bearingsurfaces therein and said ash discharge member hav-v ing convex bearingsurfaces co-operating with said concave bearing surfaces, and means tohold said bearing surfaces 1n engagement with each other, said meanscomprising a rod in the bearing portion of said ash discharge member,eye bolts through which said rod exte ds,- and means to tighten said eyebolts.

6. An underfeed stoker having, in combi: nation, oppositely'disposedmovable memdischarge.

hers forming" opposed retorts, a pair of clinker grinder rollspositioned between and below said retorts, means to rotate said grinderrolls,

grinder rolls and each having a grate portion at its upper end,connections by which each discharge member is moved with its respectiveretort member, and means to supply air to the upper portion of eachdischarge member.

7. An underfeed stoker havin in combination, a plurality of parallel ueiretorts, a structure defining a deep ash receiving pocket extendingtransversely at the rear of said retorts, a clinker grinding device, airadmitting ash discharge members forming the front wail of said pocketand extending downward adjacent said grinding device, air supplyingconnections to said memloers means to move said device, and means tooscillate said members to jointly efi'ect ash In testimony whereof wehave afiixed our signatures,

nonnnr SANFORD RILEY. JAMES W. nnnonn.

hereunto .a plurality of ash discharge. vmembers extendlng downward adacent said

